Based on a major international research project undertaken by The Institute for East West Studies, this book provides the first comprehensive analysis of an important, but little explored, feature of post-Cold War Europe: the emergence of subregional cooperation in areas such as the Barents, the Baltic Sea, Central Europe and the Black Sea. It analyses the role of subregional cooperation in the new Europe, provides detailed case studies of the new subregional groups and examines their relations with NATO and the European Union.